扫码拒绝登录后，增加刷新按钮

lib/bloc/login_qr_cubit.dart

@@ -121,7 +121,7 @@ class LoginQrCubit extends Cubit<LoginQrState> {
       int? errCode = response.errCode;
       if (errCode != null && errCode == 0) {
         _doLogin(response.authCode!);
-      } else if (errCode == -2) {
+      } else if (errCode == -4) {
         // 用户主动取消
         emit(state.copyWith(
           status: 3,

lib/ui/pages/login_v3/login_qr_page_v3.dart

@@ -256,6 +256,31 @@ class LoginQrPageV3 extends StatelessWidget {
               color: Color(0xFF333333),
             ),
           ),
+          SizedBox(height: 20),
+          InkWell(
+            onTap: () {
+              loginQrCubit.refresh();
+            },
+            borderRadius: BorderRadius.circular(25),
+            child: Container(
+              width: 200,
+              height: 50,
+              alignment: Alignment.center,
+              decoration: BoxDecoration(
+                color: Color(0xFF7691FA),
+                borderRadius: BorderRadius.circular(25),
+              ),
+              child: Text(
+                '重新登录',
+                textAlign: TextAlign.center,
+                style: TextStyle(
+                  fontSize: 18,
+                  height: 1.0,
+                  color: Color(0xFFFFFFFF),
+                ),
+              ),
+            ),
+          ),
         ],
       );
     } else if (state.status == 4) {